Direct-coupled signaling receiver with PL/DPL detector

Details Direct-coupled signaling receiver with PL/DPL detector Direct-coupled signaling receiver with PL/DPL detector

1996-10-24

1998-03-31

Chin, Tommy P.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455337, 455338, 455308, 327554, H04B 110, H04B 126, H04B 116

Patent

active

057349754

ABSTRACT:
A detector circuit (100) for detecting signaling information transmitted with a radio frequency (RF) signal for interpretation by a radio receiver includes a first low pass filter (105) for filtering demodulated audio signals that are directly coupled thereto and for providing a first filtered signal. A second low pass filter (109) is directly coupled with the first low pass filter (105) for filtering the first filtered signal and providing a second filtered signal. A signaling detector (111) is then directly coupled with the second low pass filter (109) for determining the frequency and/or bit code of signaling information included in the second filtered signal.

REFERENCES:
patent: 4600904 (1986-07-01), Shumaker
patent: 4721923 (1988-01-01), Bares et al.
patent: 4968952 (1990-11-01), Kehler, Jr.
patent: 4991227 (1991-02-01), Kehler, Jr.
patent: 5166630 (1992-11-01), Lee
patent: 5303405 (1994-04-01), Simmons et al.
patent: 5303406 (1994-04-01), Hansen et al.
patent: 5454118 (1995-09-01), Simmons et al.
patent: 5565812 (1996-10-01), Soenen

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